How to make a leather duffle bag pattern available for hand crafting

Perfectly sized for medium travels and suitable to be taken on flights as hand luggage, we made this frothy coffee looking bag for our trips. The pattern is available at or but read on for a bit more info. The bag measures about 550 x 330 x 280 mm ( 22 x 13 x 11 inches ) and the main strap is adjustable in an approximately 300 mm range. We used 2 3 mm ( 6 7 oz ) vegetable tanned leather of which about 1 square meter ( 12 square feet ) was